Malicious PDF — malware analysis report

Static analysis result for SHA-256 8681f9eb82abdc41…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 10:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 751ac598507e9aadea8caabe0ce81f9b SHA-1: 956033c3e940fd46fb28ce9e96bac366a2924fb4 SHA-256: 8681f9eb82abdc41fc7a71bb7f9022c35cc05a5a8d570b1a70019d50364f62b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gadarokujupavawew.pdf In PDF document text
    • http://stellamaris.cz/userfiles/xomidumig.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/68416067892.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/616235697.pdfIn PDF document text
    • http://wohntraumgmbh.at/45070107562.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/kimowuwanolakomopabuwivox.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/karalarenipejebelur.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/fosifaf.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/63542914185.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/povezipade.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/fifilepiseziniduvuluto.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/sivekurotuva.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f60066d15---gosojavigupariv.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ebuzosawatoduludoremim.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///pupopopafat.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/xapadolo.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/21701351157.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/zefam.pdfIn PDF document text
    • http://snft.ro/media/file/43985816572.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rusovim.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/goloziwozewilugikawo.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/pafipaxaduvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=brad+perks+of+being+a+wallflowerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 17936 bytes
SHA-256: e51c3299d2613043186b1ea93046f5961493b05c2aca22aff28d14bd14de7570
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 10948 bytes
SHA-256: 1400633fc3948745114f99f7410d157013d461a965e153722dbfb26ead29e189

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